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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2df40844177e3297f89b130e0c6cffc8f35b40eff87215cfdfe282b6b1602afa' 
  AND token = 'OG9kmUeGfxKckx+0SXsdnT+vdqHutBV+noy6jaKN8W0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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