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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d94064cdb3d245102ae57f3bfda427ef76bd6bec9c2f7abe88903a58eee57a6' 
  AND token = 'CtGLoIVG+wXX9UQpatkMAFKX0w/OS59AogAFpCRTEhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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