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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5370e114114339304d058a89e5f92709bd50ab6ad3e4950b7e92fce15f0f8bab' 
  AND token = 'rvRD959MhhbwjIJ4wtuZ5hG5ho1D66GE8yPul+kLemg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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