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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18bab3682a7193cb283519ee3b267d08a553ec74c346f32d0ab2aa1d6b1f306a' 
  AND token = 'AqcEKGeN0AG8RHwVg82W50dw7rdfBlUu+aUEObP1Y1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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