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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02e808402b2b0dca958cbc3625f23e24c800ae8090555371ac399e5749842de3' 
  AND token = '2UuaCmZCbh3YdJVJWK/bndkVk7QhpDVTYXfQVyzP+Kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}