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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6d9e74826eb815ee58fef7c225df7c2b018e83188a1e9e658f626ed6e217c88' 
  AND token = '94hApsuLz+1dVyYUP0i1hc0wQVR+r08QuW3AwFfYYnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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