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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0007e6749f8bc4c574c75a56ba5d5f8b19835f825568299574ccbca3231f2d5d' 
  AND token = '43f/n0J1PYeCk7Wqk/2q57Rz6gMh1OLYbwDhk+cLkEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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