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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16afe5fb42ea799fa4faad4b0a81a7ef15e49f824874ae479c9972e5f5ed67b3' 
  AND token = '+K+LTUlV/RUT79NsEEzf/MRs1x7cNO7Aa16USakzkDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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