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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbd1e36ae759f739ef216b310b18ddbac378b3f2421f3501266d4b14b755410a' 
  AND token = 'e8uIULp6pZth1IfKLR+1XKpimEcLSY5Co++SNPh4v/4=' 
  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"
    }
  }
}