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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a140285708d6c34c7f96887af99d0eddee81a99c17993eba57e9d35916fe710e' 
  AND token = 'ZBg5tKppk+vQNBRjAFY+FXPokRiDLL+eJA4LO3Ml2mE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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