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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94b62eaf51aaed51498300173898aa7c3ac3dd746f2d6e66f6dc87e2ce4e56f8' 
  AND token = 'NfRz550/UkJ/xe3kE2TN1skMJgxb15izuk6fz/0XXyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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