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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e5002b922bc263cd5a276ecb7d3e71ce2c2ad92875d4f07665d6290156faac4' 
  AND token = '822/Y/4hzdTo64Fm2Qlq/qah4RnfvVSXHQVSsoRHGy4=' 
  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"
    }
  }
}