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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f501678c8f582977255132c548f5d78ae99cb5ef3c8e034ec36f66d3861cdc85' 
  AND token = 'mHGcGqlj92tPh7Nx+5/wfCpEPlkU7US5wzqlLh73YSE=' 
  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"
    }
  }
}