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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad9f213ca9530881e6d2641ec46d5910feb0f98e4886875ca2d30ca74eaf8303' 
  AND token = 'r9dP0GM7iMdsJa4NvFY6ZSXGE26Mliu0H5l+21yEWNo=' 
  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"
    }
  }
}