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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a33c0b641d9676bb1a00e5fcc7f223e16f43231181974ab35e3eaaf0219816e' 
  AND token = 'c/qs1ZnJ9T3GGL7WYmolgRivOqs4Jy95X98Pw8rOnCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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