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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44d70cdd297021d5c2263a070c370daed1e1ec30649f0c6a1d983176c1e4c697' 
  AND token = '+KG1JsDIoiJNVnQ2euG3XN5hMJ0npg7eiYgEpG4ir6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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