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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e895ea8871f2e5b7242363e0036942bdb291bec881283b7ce326f55db6360b7e' 
  AND token = 'VH0Qg36fMvbBqhh8O60id4XTGuDZK7vPC6f2iykZVZY=' 
  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"
    }
  }
}