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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d7751f20101a3770a0178fe4c5628710678e0d906a372482f9b3750f950c211' 
  AND token = 'NF5kRYwR/U0kKuLPBRaxJq9qz2/IuStS035XPU8qOJ0=' 
  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"
    }
  }
}