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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8291d50b5079e107fa0eade0724762d5a84771733e8a9da33d0fc3a769656fa' 
  AND token = 'Fmo1i7y6JP2o2bL3hXzTgfnaxZxWTtG7W+48BTxHl2g=' 
  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"
    }
  }
}