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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b09c42d5a5ef5781e7e6f033fb79365310c2a9f9916826f320a005f850fd5dec' 
  AND token = '6AwTzMQb2bjVDBlpalBLrn5076hkmW7h0fkgOEH0c4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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