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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f3b13c7e9f7aa167449bb3e0193dd9d36f24ef52bc3b79f9225214c8890fb4d' 
  AND token = '8xq3454x6L9ruElDw9reLX2phihy/L43IYIvtusBW4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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