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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3896ae34aca1701aeaceaee2313e54715ad6a82fcaec990a5cddfa347f29e579' 
  AND token = 'sICd4osG3u26xYO8Z8W4aDpF835c5Co88vU9VdyWl+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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