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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfa9c3cfe69af739967ce4c81ce885ecb0f00c4352746e18ed7f2c1d249000f4' 
  AND token = '3hPA9e3I9d3vc/2B6TscmxuYvaPO7XN65RXsZlVVvmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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