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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '391366d65c1bf7fc9a7102db697d228466fe49b1944a7c76226ddb1076723c5a' 
  AND token = 'eNDejHHvS7tNojA+gtJ3JM7nxR/vL9vjaIZc1NhA5XE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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