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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e72b09432f91b87da31230332891c82a0184f4c10c768d031c4ae49539df47d' 
  AND token = 'I8KirF4ewb2vSUuUAB46/8ZoN/p4/zgBL1ITEswyTA8=' 
  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"
    }
  }
}