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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3d2d84a8781676af3127c9f34fb5c5a81075883cf0b345afd70400310d2aa42' 
  AND token = 'fhYqoQuapLh8NF4RdAd3QhmI71C5rYD3rcgs5h4R+Cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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