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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd64ca00050d0d7258dae7fb55778316695986fe915518d129af0acfdb85afec9' 
  AND token = 'Ye4cs6xk1SXi1mo7HhBYZOjKqT+va46XVdpFt1yhZks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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