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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61a845ed82f0dacbbb1766f87858a8db8dd28a0183d6ef0fb2d1d075a9b7f1c2' 
  AND token = '+cDPWoo0TWBiagXRmf3pVPlsUoNaSN1ffG1n1v9Nncc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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