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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ebf456bc78627594cf632e315912d4a673ad8b1214021b97a04398b9c449bd7' 
  AND token = 'pM1G2eiIXrqgT1DC5saoX01SEO4f8qzjqbeMD+Je0oo=' 
  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"
    }
  }
}