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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a9e03e9a9fb9ee6959f9f504148e89f872c611770b0244fdd870ff728445999' 
  AND token = 'dJb04w6eXN0epqFkoff4T+rWWllEQ8SKAFV6B2WxYos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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