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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce9f242d9d00c56971aa182e102382e8906e1191174e6dda93eea9046fa1c3b7' 
  AND token = 'Pae7ITZ2Plh2eg6tQ+v3Qsco6DfIBoqrLA8L01asOW8=' 
  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"
    }
  }
}