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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af1f52001983e74227d1ec8e66bb47ba23aa5321771d4a4dedce1958ed59849e' 
  AND token = '4wGdfyR6OD4bsykrS6i0Y0tOy3lXDcPoFzQNeS0yNGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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