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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f6fd19e9621515eaf530ca0279dc3d0b47760811bee81b890018305c1751d57' 
  AND token = '1YVfLNj0d2YDgvN0gX7FNyNKfFJIHLF41KYmXtY1gfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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