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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbc0c90178403bf8334b113ed9d8e77f6a8249e2148adc2ab75f2f35fe02ecc5' 
  AND token = 'aWUzEHda+5lAKMpx602tJO1t3vQdP4D0boBFmBJYChA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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