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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95443be35fd3019225d8f20c06722c4bc19e6ca2aedb5f8c14bfad0dc55cffcd' 
  AND token = 'CkgmiyFcDClV7VlaNyjWf7BA6iSD3n1rDDreXDYbrCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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