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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b89a74d85b469f155880719d4a9fbef16dffb570a9a048a3ba242cb555fba243' 
  AND token = '3XCLkHfRAHDgoa9NyO7tuv6r8H7tx0nhuO7MZV7tRw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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