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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ec04cc830ef3016f36f1f6bd50cdb7c1b975b5e3af1e128bc4a0a2d871226a1' 
  AND token = '3fvUbp7XC6FfpGUJAia+44oEiK++Yi2LBCwOBLyzn1c=' 
  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"
    }
  }
}