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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0270ad8a5dc945063144f29f3123c864b8001fe2d5cacd613d594481f1283400' 
  AND token = 'Cm2qP/B0gzmsPnzI1vbqndDWb3M3itdVsmJZCt42jVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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