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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3cec4d32748379898e4f211c6945b2041897e483068a1ef7bab3d84735de1ba' 
  AND token = '7HjaDPj7dfT6Ed/45SAhhfyGpusFL3aqxJVAdbCv10Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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