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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb8228d76ac80806e8f4f905913671aeb15f6c148fe96e3d1d3d65c1b0a38f32' 
  AND token = 'IntKALMzqkV6sC31Ppty/HsPiSMV9V8tNTKANwgVH8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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