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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5deb1d0e126e4865e87e2357ff51c1c2d4c1e0aa8fb013b82997a5c448df5154' 
  AND token = 'ele7+N8ag83w0PGjfpjQNAE4zLkRq4uEMnEoko6Q8B4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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