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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '685e5fd06c3ffb2b7e50950d127afea321cdb787ba71adcf87335bc37d82b25c' 
  AND token = 'ypnEFwhlLpcLq1F/449xpg+tPHeSpjFB4e0qOji1RIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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