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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60c2a3bf49c6f8eee9eaadb159bc75d11656d168715c15168e131fe14f8d3e98' 
  AND token = 'RGq8GUfrhyl78xVE34l1cy/MGmUmx36qlrvAFlK2B3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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