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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da8088007619c2d693d7d37d9dfba82b66587c2a9fb10279df9e90d42323fa73' 
  AND token = 'G4nz/Hd2Y9dDj/Pt52JRvLcObCY4+EmobrSopLuFehg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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