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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04e168ab103c687d109c5d909a427840b351a8d5db62d7182d332ae5a5e8699c' 
  AND token = 'JfoJ9gX6B+oZH90BaNe4Vp8IXSYtjYZV8ZqP3Mi/eek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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