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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bc7b656a0f16f141900834f8b666e65249b43ba48f11b21357ba3bbfd4cb634' 
  AND token = '72+NC/z+l1LX7qPVNRWxkdUM93N+VCCfe6lz6yJG/qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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