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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9968305a696a2e8906c62b60ea2a6c998aaaa4dad6a1d714f03a75b22f0ff33c' 
  AND token = 'Ctl+scBCJbFAGL5477/0Ce6A6LLJEDeDhHGx0R4NZ7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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