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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a0b8363af4b93c1703e8c685532c650332e11e230f5c3a3fc938625e77dcee1' 
  AND token = 'zh1XiYHNbEWeDyMN0UTb0fR23n8hh3EXO+ZDz9vNa9M=' 
  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"
    }
  }
}