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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ef1b955fcf00117a435703c4ada4096ad8ecac28ab022f21a935574ff26458e' 
  AND token = 'u3DjftG+FgMGI69zkKWECv8Ef/oGi2+x+o/xQoi1NDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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