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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cb9279eca6ada3898b8d325675bfa5d6d9793689f2749f8df42060eb8d287a6' 
  AND token = 'ZGiQFwRa7hCqB2u06ilrNq6Exvk/om5R7LCUGE5ubVM=' 
  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"
    }
  }
}