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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5bca8d0aa3cd7098308e2565d16aa3f3806f7f4f9c8bb9046e27de22025ff73' 
  AND token = 'jfw6BVgFeiPqlVMApG91pP06f9sT/gN2r6WJedBNeVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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