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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf5fa7a569426d2b1199bc05123aae99d835d04f70aae36b46b084dde77a9553' 
  AND token = 'J09TJec8W6RRbGqmAPBS7Ikrd+8E5iqLreksfeyXSYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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